A new siderolitid from the late Maastrichian of Italy



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Please use this identifier to cite or link to this item: http://hdl.handle.net/11703/120711
Title: A new siderolitid from the late Maastrichian of Italy
Authors: Consorci del Museu de Ciències Naturals de Barcelona
Robles-Salcedo, Raquel
Vicedo, Vicent
Parente, Mariano
Caus, Esmeralda
Issue Date: 2018
Keywords: Foraminífers fòssils
Spatial coverage: Itàlia
Access to document: http://hdl.handle.net/2072/368449
Citation: Robles-Salcedo, Raquel ; Vicedo, Vicent ; Parente, Mariano ; Caus, Esmeralda. "A new siderolitid from the late Maastrichian of Italy [poster]". 2018.
Extent: 1 pòster
Abstract: During the latest Cretaceous, many representatives of the larger benthic foraminifera (LBF) community reached a high level of “maturation”, developing large-sized shells with complex architectures. Increasing size and complexity in a relatively short period of time can be interpreted as a rapid response to biologic competition for space and resources with other LBF (like for instance fabularids, lacazinids, alveolinids, rotaliids, orbitoidids) in the shallow carbonate to mixed carbonate-clastic platforms. A paradigm of this type of fast evolution is the group of the Siderolitidae, lamellar-perforate LBF with a complex canal system that were abundant in shallow-water platforms during the late Cretaceous (Campanian-Maastrichtian). Five genera have been described up to now that represent five different steps of evolution in terms of complexity: Arnaudiella, Praesiderolites, Pseudosiderolites, Wannierina and Siderolites. In broad terms, the species ascribed to these genera replace each other in time, offering a good tool for high resolution biostratigraphy. Recent studies on material from the late Maastrichtian of Italy have yielded a siderolitid with a singular architectural pattern that differs from its relatives. The new morphotype has a very large test with large canaliferous spines and a very complex enveloping canal system. This new morphotype is the youngest siderolitid known so far. Strontium isotope stratigraphy indicates a late Maastrichtian age of 66.4 ±1.5 Ma, very close to the K-Pg boundary. The large size and very high complexity shown by the new morphotype are in accordance with the general evolutionary trends of LBF.
Appears in Collections:Paleontologia / Material gràfic

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